1a Did I go to the gym last night?
1b I didn't go to the gym last night.
2a Did Sarah like singing when she was young?
2b Sarah didn't like singing when she was young?
3a Did the wolf try to eat the little pigs?
3b The wolf did not try to eat the little pigs.
4a Did he eat a whole pizza for lunch?
4b He didn't eat a whole pizza for lunch.
5a Was the teacher happy about the school trip?
5b The teacher wasn't happy about the school trip.